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Thu, 05 Feb 2026 00:55:16 -0800 (PST) From: Jiri Olsa X-Google-Original-From: Jiri Olsa Date: Thu, 5 Feb 2026 09:55:14 +0100 To: Andrii Nakryiko Cc: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , bpf@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , Menglong Dong , Steven Rostedt Subject: Re: [RFC bpf-next 07/12] bpf: Add support to create tracing multi link Message-ID: References: <20260203093819.2105105-1-jolsa@kernel.org> <20260203093819.2105105-8-jolsa@kernel.org> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Wed, Feb 04, 2026 at 11:05:09AM -0800, Andrii Nakryiko wrote: > On Tue, Feb 3, 2026 at 1:39 AM Jiri Olsa wrote: > > > > Adding new link to allow to attach program to multiple function > > BTF IDs. The link is represented by struct bpf_tracing_multi_link. > > > > To configure the link, new fields are added to bpf_attr::link_create > > to pass array of BTF IDs; > > > > struct { > > __aligned_u64 btf_ids; /* addresses to attach */ > > __u32 btf_ids_cnt; /* addresses count */ > > cookies suspiciously missing? right, need to be added, no mystery there ;-) we will just assign it to the bpf_tramp_node object for each trampoline/id thanks, jirka > > > } tracing_multi; > > > > Each BTF ID represents function (BTF_KIND_FUNC) that the link will > > attach bpf program to. > > > > We use previously added bpf_trampoline_multi_attach/detach functions > > to attach/detach the link. > > > > Signed-off-by: Jiri Olsa > > --- > > include/linux/trace_events.h | 6 ++ > > include/uapi/linux/bpf.h | 5 ++ > > kernel/bpf/syscall.c | 2 + > > kernel/trace/bpf_trace.c | 105 +++++++++++++++++++++++++++++++++ > > tools/include/uapi/linux/bpf.h | 5 ++ > > 5 files changed, 123 insertions(+) > > > > [...]